Map netsted properties using existing mappings

[OronDF343]

I'm trying to migrate some of my projects from AutoMapper to Mapperly. I have a class structure similar to this:

public class Student
{
    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Phone { get; set; }
}

public class Course
{
    public int Id { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime EndDate { get; set; }
}

public class Enrolment
{
    public int Id { get; set; }
    public Student Student { get; set; }
    public Course Course { get; set; }
    public bool Passed { get; set; }
}

public class StudentCourseDto
{
    public int EnrolmentId { get; set; }
    public int StudentId { get; set; }
    public int CourseId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Phone { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime EndDate { get; set; }
    public bool Passed { get; set; }
}

I need to create two mappers: From Enrolment to StudentCourseDto and from Student to StudentCourseDto. The problem is how to share the mappings of the properties of Student between these mappers?

In AutoMapper, this was done using CreateMap<Enrolment, StudentCourseDto>().IncludeMembers(e => e.Student) which would map the properties of Student onto StudentCourseDto based on the existing mapping for these types.

Here is what I have so far:

[Mapper(RequiredMappingStrategy = RequiredMappingStrategy.Target)]
public partial class DtoMapper
{
    public partial IQueryable<StudentCourseDto> ProjectToDto(IQueryable<Student> q);

    [MapProperty(nameof(Student.Id), nameof(StudentCourseDto.StudentId))]
    [MapperIgnoreTarget(nameof(StudentCourseDto.EnrolmentId))]
    [MapperIgnoreTarget(nameof(StudentCourseDto.StartDate))]
    [MapperIgnoreTarget(nameof(StudentCourseDto.EndDate))]
    [MapperIgnoreTarget(nameof(StudentCourseDto.Passed))]
    public partial StudentCourseDto Map(Student source);

    public partial IQueryable<StudentCourseDto> ProjectToDto(IQueryable<Enrolment> q);

    [MapProperty(nameof(Enrolment.Id), nameof(StudentCourseDto.EnrolmentId))]
    [MapProperty(nameof(@Enrolment.Course.Id), nameof(StudentCourseDto.CourseId))]
    [MapProperty(nameof(@Enrolment.Course.StartDate), nameof(StudentCourseDto.StartDate))]
    [MapProperty(nameof(@Enrolment.Course.EndDate), nameof(StudentCourseDto.EndDate))]
    // TODO: Map properties of Student
    public partial StudentCourseDto Map(Enrolmentsource);
}

I thought of using [MapNestedProperties(nameof(StudentCourseCard.Student))], but that does not take into account the mappings I created for Student (for example StudentId won't be mapped in this example). I considered the new feature of IncludeMappingConfiguration, but it copies the mappings verbatim (doesn't work for nested mappings which will have a different path).

Is there any solution for this issue that is compatible with LINQ projections?

[latonz]

Support to include existing mapping configurations was recently implemented in #1833 and will be part of Mapperly 3.6.0. See also #513.

[OronDF343]

I have seen this feature, but it doesn't appear to support including the configurations on a nested object. In my use case, the resulting property paths will need to be different.

    [MapProperty(nameof(Student.Id), nameof(StudentCourseDto.StudentId))]
// is not equivalent to
    [MapProperty(nameof(@Enrolment.Student.Id), nameof(StudentCourseDto.StudentId))]

Or did I misunderstand how the new feature works?

[latonz]

No you are correct, this is not supported by Mapperly. You need to reconfigure all your settings.